1.Inch:12" -28" 2.Rubber surface treatment: graphite,teflon coating 3.Material:natural rubber and spring steel FRAMELESS WIPER BLADE-- ... armU-hook ,Bayonet ,Screw ,Side Pin wiper armBMWRubber surface treatmentGraphite coating ,teflon coatingBuickColorcarbon fiber,chrome,red,blue,and yellowChevroletStructurewiper arm,wiper adaptor ...